Solubility diagrams for tetrasodium, and trisodium, and disodium hypophosphate have been prepared, and compared with those from previous work. The tetrasodium salt shows an inversion of solubility at 66·5°, interpreted as a change in the stable phase from Na4P2O6, 10H2O at low temperatures to the anhydrous salt above 66·5°. The trisodium salt shows an inversion at 58·5°, attributed to a change from the low-temperature form, Na3HP2O6, 9H2O, to the anhydrous high-temperature form. The disodium salt has an inflection in the solubility curve at 80·5° corresponding to the change of Na2H2P2O6, 6H2O into the anhydrous salt.
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Journal of the Chemical Society A: Inorganic, Physical, Theoretical
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